1
(x²-1)²(x-3)<0<br>x=1 x=3
_ _ +
--------------(1)-----------------(3)------------------
x∈(-∞;1) U (1;3)
2
(x-1)/(x+3)≥0
x=1 x=-3
+ _ +
----------------(-3)---------------[1]-------------------
x∈(-∞;-3) U [1;∞)
3
(x-2)²/(x+5)<0<br>x=2 x=-5
_ + +
--------------------(-5)--------------(2)------------------------
x∈(-∞;-5)
4
x²-4≤0
(x-2)(x+2)≤0
x=2 x=-2
+ _ +
----------------[-2]----------------[2]-----------------------
x∈[-2;2]